Baroness Margaret Thatcher leaves the Cabinet War Rooms after the Royal opening of the William Churchill museum on the 40th anniversary of his death in London on February 10, 2005. (UPI Photo/Hugo Philpott)

Margaret Hilda Thatcher, Baroness Thatcher, LG, OM, PC, FRS (née Roberts; born 13 October 1925) is a former Prime Minister of the United Kingdom who served from 1979 to 1990.

Born in Grantham, Lincolnshire, Thatcher studied chemistry at Somerville College, Oxford before qualifying as a barrister. In the 1959 general election she became MP for Finchley. Edward Heath appointed Thatcher Secretary of State for Education and Science in his 1970 government. In 1975 she was elected Leader of the Conservative Party, the first woman to head a major UK political party, and in 1979 she became the UK's first female Prime Minister.

After entering 10 Downing Street Thatcher was determined to reverse what she perceived as a precipitous national decline. Her political philosophy and economic policies emphasised deregulation, particularly of the financial sector, flexible labour markets, the sale or closure of state-owned companies, and the withdrawal of subsidies to others. Thatcher's popularity waned amid recession and high unemployment, until economic recovery and the 1982 Falklands War brought a resurgence of support resulting in her re-election in 1983.

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